Numerical simulation of radiative heat transfer from non-gray gases in three-dimensional enclosures

“…The double integration is more accurate than the convolution approach, but the double integration needs significantly more computational demand in case of mixtures of two and more absorbing gases; generally the SLW-di demands large computation time of the square as of SLW-cv approximately. As an example the calculation time of the SLW-di is from 2 times to 25 times as large as that of SLW-cv for this case in Coelho (22) . The relative error of the peak radiative source value (net emission) using the WSGG-RG10 model is 10.3% which shows relatively large error, but the average relative error is 4.05%.…”

Section: 3 Co 2 -H 2 O-n 2 Mixture With Non-uniform Temperature Anmentioning

confidence: 93%

“…In this study, we used the DOM and the T 4 quadrature set with the same grid systems used by Liu (19) . Coelho (22) also performed some comparative numerical works using various radiative models for the same problems. The results by Liu (19) and Coelho (22) are used as the comparison data in this study and reference values of all errors are the results by Liu (19) .…”

Section: Three-dimensional Problemmentioning

confidence: 99%

“…Table 1 shows the average and maximum errors of the radiative heat source terms using the WSGG-RG4 and other models. The errors for WSGG-smith, SLW-3 and SLW-20 models are taken from Coelho (22) . The WSGGsmith denotes the results obtained by using conventional WSGGM with the parameters generated by Smith et al (16) The SLW-20 and the SLW-3 denote the results obtained by using the SLW model with 21 and 4 gray gases including additional transparent gas.…”

Section: 1 Pure H 2 O With Uniform Temperature and Concentration Dmentioning

confidence: 99%

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Development of the WSGGM Using a Gray Gas Regrouping Technique for the Radiative Solution within a 3-D Enclosure Filled with Nonuniform Gas Mixtures

Park

Kim

2005

JSME international journal. Ser. B, Fluids and thermal engineer

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A narrow band based WSGGM with a gray gas regrouping technique is proposed for nonhomogeneous and nonisothermal combustion gas mixtures. Applying the multiplication property of narrow band-average transmissivities for gas mixtures of CO 2 -H 2 O, the number of gray gases, required for accurate representation of the absorption characteristics by using the narrow band based WSGGM, is increased drastically. To reduce the computational loads by reducing the number of gray gases, we propose a gray gas regrouping process where the gray gases used for the WSGGM are regrouped into a specified number of groups according to the magnitudes of absorption coefficients. To evaluate the proposed WSGGM for gas mixtures, the radiative transfer problems through CO 2 -H 2 O gas mixtures in 1-and 3-dimensional enclosures are solved numerically by using the discrete ordinates method. The radiative heat source terms and the radiative heat fluxes obtained by using the proposed method are fairly well compared to those obtained by using the more accurate statistical narrow band model with an excellent computational efficiency.

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“…Although several solution methods are suggested for threedimensional enclosures, the applicability and accuracy of these methods have yet to be tested fully, especially for nongray gases. This is because little measured data and/or reference solutions for threedimensional nongray gas radiation problems can be found in the literature, such as results of Liu [8], Park and Kim [9], and Coelho [10].…”

Section: Introductionmentioning

confidence: 99%

Numerical solution of radiative transfer within a cubic enclosure filled with nongray gases using the WSGGM

Park

Kim

2008

J Mech Sci Technol

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Using a weighted sum of gray gases model with gray gas regrouping technique (WSGGM-RG), problems of radiative transfer within three-dimensional enclosures filled with non-homogeneous and non-isothermal combustion gas mixtures were solved. The radiative transfer equation was solved based on discrete ordinate method (DOM) and raytracing method (RTM) with WSGGM-RG. The results using WSGGM-RG were compared with those using the statistical narrow band (SNB) model. The average radiative intensities and radiative heat fluxes using WSGGM-RG corresponded relatively well to those using the SNB model as reference data. A very good computational efficiency was also noted.

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Numerical simulation of radiative heat transfer from non-gray gases in three-dimensional enclosures

Cited by 106 publications

References 43 publications

Detailed numerical simulation of radiative transfer in a nonluminous turbulent jet diffusion flame

Detailed numerical simulation of radiative transfer in a nonluminous turbulent jet diffusion flame

Development of the WSGGM Using a Gray Gas Regrouping Technique for the Radiative Solution within a 3-D Enclosure Filled with Nonuniform Gas Mixtures

Numerical solution of radiative transfer within a cubic enclosure filled with nongray gases using the WSGGM

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